Thanks to "Coop" on the forum I have got a TE wideband lambda (O2).

The great folks at Gotham pretuned my PFC plenty rich. I did a run in fourth gear.

Was good on the AFRs until 5.8k-6K Rs and above when the AFRs went into the 13s

So I added and added fuel on the PFC from 4k and up till the PIM value went from 100% to 149.66% and still the AFRs where in the 13s right at 6k and above. The fuel was being added 'cause the Rs started to bump from being to rich.

I have a Supra TT and -8an billet Al K&N filter with glycerin filled pressure guage. Seems right above 6k I am having problems no matter how much fuel. Imjector have been flowed and balanced by RC twice to check for problems.

Thanks for your feedback and btw, a new supra TT pump is on the way.

 

That's very odd. If you were at 150% on the PIM and still showing 13s, something doesn't seem right to me. I recommend calling Steve at the shop and getting his take on it

take it easy--

 

Your fuel system is inadequate somehow, whether its the filter, pump, injectors, rail, or lines.

Your running out of fuel on the top end, and the PFC is trying to add fuel but your system cannot push any more fuel into the motor. What mods do you have to the motor and more specifically the fuel system.

This is all how I see it anyways. My guess is that your problem will go away when you get your new pump in.

 

The problem is not the pump, he has a Supra TT pump, good for quite a bit of power, I don't see him exceeding it's limits for quite some time.

I'm surprised you didn't blow your motor at 13:1, that's waaaay to lean. What all is in your fuel system?

 

What about injectors and FPR and stuff? the pump is only part of the equation, right?

 

check your secondaries. they may not be firing correctly or they may not be big enough to supply the fuel you need.

 

I have ordered a new pump from Gotham (per Steve's recommendation)...same pump Supra TT but brand damn new.

A forum member posted just a few days back about the billet K&N had too much pressure drop and was leaning out at high RPMs so he removed the K&N and went with Aeromotive (or is it Aeroquip?).

Obviously, I am fuel starving and will start by replacing the fuel pump ASAP and I do stay below 6k on the tach.

Doesn't the motor run two voltage settings? Maybe i am not going to the second voltage setting? Just curious cause with my luck I will install a new fuel pump and it will still have this problem.

Thanks so much for your feedback and Steve at Gotham has been very supportive technically especially as busy as he has been he has always found the time to help me.

 

Also I think with my mods (all bolt ons) the 850cc secondaries should be enough, no?

 

Well, that depends. How much boost will you be running? Also, have you ever dynoed? According to the fuel calculator linked below, the stock fuel injectors can support 288 rwhp at 85% and 339 at 100%. You really want to keep your peak inj duty cycle at or below 85%. What is your peak inj duty cycle after a 3rd/4th WOT pull to redline?

http://www.maxcooper.com/rx7/how-to/...tem/calcs.html

 

Cannot run to redline because of the 6k AFRs But I could use the peak hold function on the display...Maybe I need 1300cc's? With my mods I should be around >=30rwhp

CAI, full exhuast, PFC, 8.5#flywheel, 99spec twins, m2SMIC, stock injectors, supra TT, 13-14psi

Maybe I am at my secondary limits?

 

I would go with the 1300cc injectors. You are maxing the stockers at at that psi with the 99specs..

 

Did a run using the PFC map function on the commander (until I get the laptop for the datalogit) and right around 70% duty cycle I start getting very lean...this is crazy! R/C said the injectors are perfect. Should do better than 70%?!

Definitely getting to my wits end with this car...lots of money and very little performance return...just f**king headaches.

Tell me I bought a fuel pump that was bad...

 

More feedback? Anyone?

Did a peak hold right around 5.5 - 6k Rs The AFRs scale to dangerous levels...